With Oscillator Circuit Protective Means Patents (Class 331/62)
  • Publication number: 20150116043
    Abstract: An oscillation circuit includes a terminal XO which is connected to one end of a resonator, a terminal XI which is connected to the other end of the resonator, an oscillation unit which is electrically connected to the terminal XO and the terminal XI, a control voltage generation circuit, and a switch. The oscillation unit includes a variable capacitive element having one end which is connected to the terminal XO or the terminal XI. The switch controls electrical connection between the other end of the variable capacitive element and an output terminal of the control voltage generation circuit.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMOTO, Akihiro FUKUZAWA
  • Publication number: 20150116045
    Abstract: An oscillation circuit includes a terminal XO, a terminal XI, an oscillation unit, and a voltage generation circuit that generates a first voltage and a second voltage. The oscillation unit includes a variable capacitive element connected to the terminal XO or the terminal XI. In a first mode, a signal having a first amplitude is applied between the terminal XO and the terminal XI, and a first voltage is applied to the other end of the variable capacitive element. In a second mode, a signal having a second amplitude larger than an amplitude of the signal having the first amplitude is applied between the terminal XO and the terminal XI, a second voltage is applied to the other end of the variable capacitive element, and a voltage applied to the both ends of the variable capacitive element is lower than the maximum rated voltage of the variable capacitive element.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMATO, Akihiro FUKUZAWA
  • Publication number: 20150116044
    Abstract: An oscillation circuit includes: an oscillation unit which includes a first terminal and a second terminal connected to a resonator, a third terminal, a fourth terminal to which at least one of a power supply potential and a signal for inspecting the resonator is applied, a first switching unit which switches modes of electrical connection between the first terminal and the third terminal, and a second switching unit which switches modes of electrical connection between the second terminal and the fourth terminal.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Yosuke ITASAKA, Masayuki ISHIKAWA, Takehiro YAMAMOTO, Akihiro FUKUZAWA
  • Publication number: 20140232476
    Abstract: A wiring pattern for oscillation input signal and a wiring pattern for oscillation output signal are provided on a printed circuit board, and a wiring pattern for ground power source voltage is arranged in a region therebetween. A quartz crystal unit is connected between the wiring pattern for oscillation input signal and the wiring pattern for oscillation output signal and one ends of capacitors serving as load capacitors thereof are connected to the wiring pattern for ground power source voltage. Further, a wiring pattern for VSS is arranged so as to enclose these wiring patterns, and a wiring pattern for VSS is arranged also in a lower layer in addition thereto. By this means, reduction of a parasitic capacitance between an XIN node and an XOUT node, improvement in noise tolerance of these nodes and others can be achieved.
    Type: Application
    Filed: April 28, 2014
    Publication date: August 21, 2014
    Applicant: Renesas Electronics Corporation
    Inventors: Osamu Ozawa, Masashi Horiguchi, Yuichi Okuda, Akihito Anzai
  • Patent number: 7940138
    Abstract: An oscillation circuit according to the present invention comprises a solid-state oscillator, an amplifier for feedback-controlling the solid-state oscillator, and ESD protecting circuits respectively connected to the input and output sides of the amplifier, wherein the ESD protecting circuit on the input side of the amplifier comprises an ESD protecting element whose constituent is a diode having a P-type diffusion layer and an N-type diffusion layer, and the ESD protecting circuit on the output side of the amplifier comprises an ESD protecting element whose constituent is an MOS transistor.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: May 10, 2011
    Assignee: Panasonic Corporation
    Inventor: Masato Maede
  • Patent number: 7836516
    Abstract: To provide a microelectronic circuit arrangement (100) and a method for protecting at least one electronic component against illicit manipulation and/or unauthorized access, in which circuit arrangement (100) and method there are no opportunities for manipulation even during or in connection with the start-up procedure, it is proposed that there be arranged at least activating unit (Ai; i=1, 2, 3, 4, 5) for checking whether at least one activating condition is met and for activating at least one preventing unit (Vj; j=1, 2, 3, 4, 5, 6, 7) that is also associated with the circuit arrangement (100) and that is connected to the activating unit (Ai), by means of which preventing unit (Vj) the component (200) can be at least partly de-activated and/or at least partly destroyed in the event of illicit manipulation and/or unauthorized access.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: November 16, 2010
    Assignee: NXP B.V.
    Inventors: Wolfgang Stidl, Thomas Rottschäfer
  • Patent number: 7777474
    Abstract: A DC-DC converter for converting an input voltage and generating an output voltage. The DC-DC converter includes an adjustment resistor. A control circuit generates a control signal and includes an external terminal to which the adjustment resistor is externally connected. A switching transistor is connected to the control circuit and turned on or off in accordance with the control signal. The control circuit includes an oscillator that generates an oscillation signal. The control circuit generates the control signal based on the oscillation signal and a signal that is in accordance with an output voltage or output current of the DC-DC converter. The oscillator monitors a first amount of current flowing through the external terminal of the control circuit and generates the oscillation signal in a cycle that is accordance with the monitoring result.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: August 17, 2010
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Yukinori Maekawa, Yoshihiro Nagaya, Keita Sekine, Takashi Matsumoto, Takehito Doi
  • Publication number: 20100134193
    Abstract: An oscillation circuit according to the present invention comprises a solid-state oscillator, an amplifier for feedback-controlling the solid-state oscillator, and ESD protecting circuits respectively connected to the input and output sides of the amplifier, wherein the ESD protecting circuit on the input side of the amplifier comprises an ESD protecting element whose constituent is a diode having a P-type diffusion layer and an N-type diffusion layer, and the ESD protecting circuit on the output side of the amplifier comprises an ESD protecting element whose constituent is an MOS transistor.
    Type: Application
    Filed: February 4, 2010
    Publication date: June 3, 2010
    Applicant: Panasonic Corporation LLP
    Inventor: Masato MAEDE
  • Patent number: 7683728
    Abstract: An oscillation circuit according to the present invention comprises a solid-state oscillator, an amplifier for feedback-controlling the solid-state oscillator, and ESD protecting circuits respectively connected to the input and output sides of the amplifier, wherein the ESD protecting circuit on the input side of the amplifier comprises an ESD protecting element whose constituent is a diode having a P-type diffusion layer and an N-type diffusion layer, and the ESD protecting circuit on the output side of the amplifier comprises an ESD protecting element whose constituent is an MOS transistor.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: March 23, 2010
    Assignee: Panasonic Corporation
    Inventor: Masato Maede
  • Patent number: 7477495
    Abstract: An integrated circuit includes first and second power supply voltage terminals, a voltage controlled oscillator (VCO), and a deep N-well field effect transistor (FET). The VCO has a first node coupled to the first power supply terminal, a second node, and first and second oscillator output terminals, at least one of which is coupled to a common pin. The deep N-well field-effect transistor (FET) has a first terminal coupled to the second node of the voltage controlled oscillator, a second terminal coupled to the second power supply terminal, and a control electrode to receive a power on signal, a deep N-well is coupled to the first power supply terminal and a P-channel is coupled to the second power supply terminal to form a high impedance electrostatic discharge path between the common pin and the first and the second power supply terminals through the deep N-well.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: January 13, 2009
    Assignee: Silicon Laboratories, Inc.
    Inventor: Andrew W. Dornbusch
  • Publication number: 20080116984
    Abstract: An oscillation circuit according to the present invention comprises a solid-state oscillator, an amplifier for feedback-controlling the solid-state oscillator, and ESD protecting circuits respectively connected to the input and output sides of the amplifier, wherein the ESD protecting circuit on the input side of the amplifier comprises an ESD protecting element whose constituent is a diode having a P-type diffusion layer and an N-type diffusion layer, and the ESD protecting circuit on the output side of the amplifier comprises an ESD protecting element whose constituent is an MOS transistor.
    Type: Application
    Filed: November 16, 2007
    Publication date: May 22, 2008
    Inventor: Masato MAEDE
  • Patent number: 7113050
    Abstract: An integrated circuit (IC) with an oscillator and electrostatic discharge (ESD) protection in which the parasitic capacitance of the ESD protection circuitry is disassociated from the oscillator circuitry to minimize loading of the tank circuit thereby minimizing degradation of the tank circuit quality factor (Q).
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: September 26, 2006
    Assignee: National Semiconductor Corporation
    Inventor: Eric Lindgren
  • Patent number: 6593823
    Abstract: An oscillation circuit including a first electrostatic protection circuit connected between a signal path of the oscillation circuit and a constant-voltage side, and bypassing an electrostatic voltage of a first polarity that intrudes into the signal path to a side of a constant bypass voltage through a first semiconductor rectifier element. A second electrostatic protection circuit is connected between the signal path and a reference potential side, and bypassing an electrostatic voltage of a second polarity that intrudes into the signal path to the reference potential side through a second semiconductor rectifier element. The constant bypass voltage is set to a value such that the first and second semiconductor rectifier elements are not turned on by voltage change in the signal path caused by a leakage current, even when a leakage current is generated between the signal path and a power-supply voltage line.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: July 15, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Shinji Nakamiya, Hiroshi Yabe, Tadao Kadowaki, Yoshiki Makiuchi
  • Publication number: 20030107443
    Abstract: There are provided an internal oscillation transistor; a terminal that is connected to the base of the oscillation transistor and to which an external resonance circuit is to be connected; and two internal diodes provided between the terminal and the ground, for preventing electrostatic breakdown of the oscillation transistor. The cathodes of the two diodes are connected to each other and supplied with a reverse-bias voltage. The anode of one diode is grounded and the anode of the other diode is connected to the terminal by a first resistor. An internal second resistor for DC-grounding the terminal is also provided.
    Type: Application
    Filed: December 4, 2002
    Publication date: June 12, 2003
    Applicant: Alps Electric Co., Ltd.
    Inventor: Masaki Yamamoto
  • Patent number: 6320473
    Abstract: The present invention relates to oscillator circuits for providing periodic signals. The oscillator circuit includes a crystal element having a high Q value and good stability. A high-gain amplifier is used with the crystal element to produce an oscillating signal. The oscillator is further configured to include an input protection circuit for reducing the effects of undesirably high input voltage levels, and a coupling capacitor to reduce leakage between the amplifier and the input protection circuit. A high output signal level is provided to a Schmidtt trigger amplifier through configuring the output to be taken from the input of the high-gain amplifier.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: November 20, 2001
    Assignee: STMicroelectronics, Inc.
    Inventor: Horst Leuschner
  • Patent number: 6181214
    Abstract: An integrated circuit oscillator input cell has an oscillator input pad, an oscillator feedback pad, a core terminal, an inverter and an electrostatic discharge protection circuit. The inverter has an inverter input, which is coupled to the oscillator input pad, and an inverter output, which is coupled to the oscillator feedback pad and the core terminal. The electrostatic discharge protection circuit includes a plurality of N-channel protection transistors, which are coupled to the oscillator input pad. The N-channel protection transistors are the only protection transistors that are coupled to the oscillator input pad.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: January 30, 2001
    Assignee: LSI Logic Corporation
    Inventors: Jonathan A. Schmitt, Carol C. Anderson
  • Patent number: 6147564
    Abstract: An oscillation circuit including an electrostatic protective circuit connected between a signal path and this constant voltage V.sub.reg. It comprises a first electrostatic protective circuit portion that causes any electrostatic voltage of a first polarity that invades the signal path to be selectively diverted through a diode to the constant voltage V.sub.reg side of the circuit, and any electrostatic voltage of a second polarity that invades the signal path to be selectively diverted through another diode to the ground side. This ensures that the oscillation circuit is not affected by fluctuations in the power voltage from the main power source, enabling it to oscillate at a stable frequency.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: November 14, 2000
    Assignee: Seiko Epson Corporation
    Inventors: Shinji Nakamiya, Hiroshi Yabe, Tadao Kadowaki, Yoshiki Makiuchi
  • Patent number: 5929715
    Abstract: An oscillation circuit is driven at reduced power by a constant voltage V.sub.reg having an absolute value that is lower than that of a power voltage V.sub.ss of a main power source. An electrostatic protective circuit provided in this oscillation circuit is connected between a signal path and this constant voltage V.sub.reg. It comprises a first electrostatic protective circuit portion that causes any electrostatic voltage of a first polarity that invades the signal path to be selectively diverted through a diode to the constant voltage V.sub.reg side of the circuit, and any electrostatic voltage of a second polarity that invades the signal path to be selectively diverted through another diode to the ground side. This ensures that the oscillation circuit is not affected by fluctuations in the power voltage from the main power source, enabling it to oscillate at a stable frequency.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: July 27, 1999
    Inventors: Shinji Nakamiya, Hiroshi Yabe, Tadao Kadowaki, Yoshiki Makiuchi
  • Patent number: 5359300
    Abstract: A phase locked loop PLL circuitry for use in a radio pager. A power source applies a voltage to a charge pump circuit. A power supply control circuit controls the application of the voltage.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: October 25, 1994
    Assignee: NEC Corporation
    Inventor: Yoichiro Minami
  • Patent number: 5332979
    Abstract: An RF power-generator system for the frequency range of 2 to 30 MHz and a programmable sinusoidal power output of 0 to 1000 W. The system is constructed of modules (10, 30, 50, 70 and 90) accommodated in a shallow parallelepipedal housing (1) with a capacity of 4.6 l. The housing essentially comprises two lateral lengths (4) of structural section, a sheet-metal front (6), a sheet-metal bottom (5), and a lid. A crystal-controlled power-oscillator module (10) communicates by way of an RF line (121) with an intermediate module (30). The intermediate-amplifier module communicates by way of still another RF line (122) with a terminal power-amplifier module (50). The terminal power-amplifier module communicates by way of still another RF line (123) with a high-power filter (70). The filter communicates by way of still another RF line (124) with a high-power directional coupler (90). The RF power output can be intercepted at an RF plug (2).
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: July 26, 1994
    Inventors: Janusz Roskewitsch, Matthias Huttl
  • Patent number: 5053727
    Abstract: A circuit comprising an oscillator having a load coupled thereto by means of at least one voltage-dependent coupling element that exhibits a high impedance at relatively low voltages and low impedance at relatively higher voltages. The voltage-dependent coupling element can comprise two series connected Zener diodes connected such that the anodes of the diodes are coupled together. The voltage-dependent coupling element can also comprise a varistor.
    Type: Grant
    Filed: April 23, 1990
    Date of Patent: October 1, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wolfango Jann, Kurt Rottner
  • Patent number: 4694224
    Abstract: A lighting apparatus for an electric discharge lamp includes a lighting ballast capacitor connected in series to an electric dicharge lamp for stabilizing a lighting current to the lamp; a preheating ballast capacitor connected in parallel to the lamp for supplying a preheating electric power to the lamp; electric power supply including an output transformer for supplying an electric power to the lighting ballast capacitor; a control electric power supply circuit for obtaining a control electric power through the lighting ballast capacitor and discharge lamp or the preheating ballast capacitor without adding a stepdown transformer or a resistive element for voltage drop; and an oscillator which receives the control electric power from the control power supply circuit and controls the electric power supply. With this lighting apparatus, the electric power loss is made small and the miniaturization of the apparatus can be realized.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: September 15, 1987
    Assignee: Hitachi Lighting, Ltd.
    Inventors: Hisato Nakagawa, Hideo Kuwahara, Atsuo Koyama, Mitsuo Akatsuka
  • Patent number: 4564820
    Abstract: A blocking oscillator converter with controlling logic system has an oscillator which, in the active state, blocks control of a switching transistor of the converter, and hence feeding of the electronic apparatus to be supplied by the converter. The oscillator blocks the output of a control circuit in the active state and, in the passive state, has no influence on the control of the switching transistor by the control circuit. The active state of the oscillator is triggered by monitoring of the possible operational errors by an error indicator when such an operational error occurs. After decay of the operational error has taken place, the oscillator again returns to the passive state. The advantage of the blocking oscillator converter with controlling logic system is primarily provided through a considerable reduction of the power dissipation in the blocking oscillator converter, and primarily in its switching transistor during error indications.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: January 14, 1986
    Assignee: Siemens Aktiengesellschaft
    Inventors: Gunther Peruth, Michael Lenz
  • Patent number: 4189685
    Abstract: A transistor oscillator circuit wherein the load current applied to animal tissue treatment electrodes is fed back to the transistor. Removal of load is sensed to automatically remove feedback and stop oscillations. A thermistor on one treatment electrode senses temperature, and by means of a control circuit controls oscillator transistor current.
    Type: Grant
    Filed: March 14, 1978
    Date of Patent: February 19, 1980
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: James D. Doss
  • Patent number: 4051445
    Abstract: A magnetically coupled two transistor multivibrator for use with power supplies. In addition to the usual collector driven output transformer, an auxiliary transformer having its secondary winding in series with the transistor base drive circuits is employed. The auxiliary transformer has primary windings powered by emitter current. Provision is also made for feedback from the main output transformer so that the secondary base drive windings can be powered from either emitter or collector currents. Electronic means are employed to isolate the output transformer from the base drive transformer upon the occurrence of a short circuit in the load, thus permitting the emitter windings to take over the function of supplying feedback and maintaining oscillations.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: September 27, 1977
    Assignee: Boschert Assoc.
    Inventor: Robert J. Boschert
  • Patent number: 4048584
    Abstract: A two pin CMOS oscillator includes an improved input protection circuit which includes pairs of back-to-back diodes coupled between the input of an amplifier portion of the oscillator and the two power conductors which energize the oscillator. Provision of the back-to-back diode pairs permits use of an internal timing capacitor coupled between the output and input of the amplifier portion of the oscillator to be partially charged by an external timing resistor to a switching point of the amplifier portion of the oscillator. When the amplifier portion of the oscillator switches, the voltage at the input may be boosted or bootstrapped to voltages considerably beyond the range of voltage between the two voltage conductors. Thus, clipping of the voltage swings at the timing node of the oscillator by the protection circuit is avoided, and improved performance is achieved, especially at high frequencies.
    Type: Grant
    Filed: November 26, 1976
    Date of Patent: September 13, 1977
    Assignee: Motorola, Inc.
    Inventor: Richard Walter Ulmer
  • Patent number: 4005335
    Abstract: A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a 115 volt ac source rectified to provide a 150 volt dc input and providing a 20,000 hertz output. An inverter with a transistor current control for protection against transistor damage under open circuit, starting and no-load conditions, with low power consumption under no-load and with dimming capability. An inverter with a detector circuit connected across the feedback winding or an additional control winding for developing a control signal varying as a function of the feedback winding output, and a zener diode or other device for connecting the control signal to the base of the transistor in current controlling relation when the control signal exceeds a predetermined value.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: January 25, 1977
    Assignee: Iota Engineering Inc.
    Inventor: Lloyd J. Perper
  • Patent number: 3946280
    Abstract: This invention refers to an overload protection circuit for an oscillatory circuit driving an electro-acoustic converter and more specifically concerns a circuit for automatically inhibiting the oscillatory circuit in the presence of an overload. The overload protection circuit monitors the collector-emitter voltage signal and the base-emitter voltage signal for providing an overlap signal responsive to the interval when both mentioned voltage signals are in their high condition. Such a condition is indicative of the power dissipated in a switching transistor of the oscillatory circuit. The overlap signal is integrated and the integrated signal is compared to a predetermined voltage level. When the integrated signal exceeds the predetermined voltage level, the oscillatory circuit is inhibited.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: March 23, 1976
    Assignee: Branson Ultrasonics Corporation
    Inventor: Eric G. Quist